DataVXACS Applied Materials & InterfacesPaper
journal article·2024-01-31

Decoration of Gold and Platinum Nanoparticle Catalysts by 1 nm Thick Metal Oxide Overlayer and Its Effect on the CO Oxidation Activity

Kaho Okayama, Akihiro Nakayama, Toru Murayama, Norihito Sakaguchi, Feng Hong, Botao Qiao, Junhu Wang, Tetsuya Shimada, Shinsuke Takagi, Tamao Ishida

ACS Applied Materials & Interfaces· Volume 16· Issue 4
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Source abstract

Abstract

Exfoliated M–Al layered double hydroxide (M–Al LDH; M = Mg, Co, Ni, and Zn) nanosheets were adsorbed on Au/SiO 2 and calcined to transform LDH into mixed metal oxides (MMOs) and yield Au/SiO 2 coated with a thin MMO overlayer. These catalysts showed a higher catalytic activity than pristine Au/SiO 2 . In particular, the 50% CO conversion temperature decreased by more than 250 °C for Co–Al MMO-coated Au/SiO 2 . In contrast, the deposition of CoAlO x on Au/SiO 2 by impregnation or the deposition of Au on Co–Al MMO-coated SiO 2 resulted in a worse catalytic activity. Moreover, the presence of a thick MMO overlayer decreased the catalytic activity, suggesting that the control of the overlayer thickness to less than 1 nm is a requisite for obtaining a high catalytic activity. Moreover, the thin Co–Al MMO overlayer on Au/SiO 2 possessed abundant oxygen vacancies, which would play an important role in O 2 activation, resulting in a highly active interface between Au and the defect-rich MMO on the Au NP surface. Finally, this can be applied to Pt/SiO 2, and the obtained Co–Al MMO-coated Pt/SiO 2 also exhibited a much improved catalytic activity for CO oxidation.
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Research context

NanomaterialsCatalysis & surfacesMaterials processing

OpenAlex topics: Catalytic Processes in Materials Science · Catalysis and Oxidation Reactions · Nanomaterials for catalytic reactions

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan

Yantai Key Laboratory of Gold Catalysis and Engineering, Shandong Applied Research Center of Gold Nanotechnology (AU-SDARC), School of Chemistry & Chemical Engineering, Yantai University, 30 Qingquan Road, Yantai 264005, China

Laboratory of Integrated Function Materials, Center for Advanced Research of Energy and Materials, Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan

CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China

Center for Advanced Mössbauer Spectroscopy, Mössbauer Effect Data Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China

Funding

Ministry of Education, Culture, Sports, Science and Technology · Japan Society for the Promotion of Science · National Natural Science Foundation of China · Izumi Science and Technology Foundation

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